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Finding the Fourth Proportional to 921.55, 1,382.34 and 272.30

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Solution

The fourth proportional to 921.55, 1,382.34 and 272.30 is: 408.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.55 : 1,382.34 = 272.30 : x
  2. Step 2: Convert to fraction form
    921.55/1,382.34 = 272.30/x
  3. Step 3: Cross multiply
    921.55x = 1,382.34 × 272.30
  4. Step 4: Simplify right side
    921.55x = 376,411.18
  5. Step 5: Solve for x
    x = 376,411.18/921.55
  6. Step 6: Final answer
    x = 408.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.